Rebecca Aylward's head was smashed in with a rock by a teenager killer who did it for a free breakfast

A heartbroken mother has revealed her teenage daughter's last words before she was brutally beaten to death for a bet - "Bye mam, I love you".

Rebecca Aylward was just 15-years-old when was lured to woods in Aberkenfig, near Bridgend, by 16-year-old Joshua Davies on the pretence of a date.

But, once there, he smashed the teenager’s skull with a large rock in an apparently senseless killing.

Davies, who had killed Rebecca simply for a free breakfast from a mate, was found guilty in 2011 of murder after a trial and will have to serve a minimum of 14 years.

Now Rebecca's mum Sonia Oatley has written a book telling the appalling story behind her daughter's senseless death, Wales Online reports.

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Mums Pain: Sonia Oatley's book reveals the last moments she shared with her daughter Rebecca Aylward before she was killed.

In an interview with the Daily Mail, Sonia spoke about the last time she saw Rebecca alive, when she was heading off for a date with the boy that would become her killer.

She said: “I can still see the moment that her aunt Linda pulled up outside to drive her to the nearby village of Sarn where they’d agreed to meet, as I didn’t drive myself.

“Becca pulled on her new red jacket and brown ankle boots, gave me a kiss and hug and said: ‘Bye Mam, I love you!’

‘Love you, too,’ I told her, as I kissed and hugged her back. ‘See you in a bit.’

“She turned to wave just before she climbed into the car and I remember thinking how happy she looked. Becca never returned, of course.”

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Senseless Killing: Rebecca Aylward was killing in the woods with a rock, for a bet.

Davies was dubbed the “breakfast bet killer” when the motive for the murder was uncovered. Two days before the murder, Josh had texted his friend: “Don’t say anything, but you may just owe me a breakfast.”

Sonia said: “It beggars belief: there are no words to express my repugnance and desolation. How do you rationalise human behaviours that are so far from human, or try to understand how a young person could have such determination to end the life of another? Quite simply, you can’t.

“Davies showed he had no conscience at all. He spent most of his time laughing during court proceedings. Then there are the two friends who knew of his intentions, and I will always wonder why they didn’t think to alert anyone.

“Some people speak of ‘closure’ at such a point, but the truth is the torture of losing a child in such a brutal way never ends.

“Now, nearly four years since Becca’s death, the pain of her loss has not abated, and neither has my profound hatred for her killer.

“That is why I have decided to detail the full hurt and horror that my family has endured in a book, as I want the world to know what really happened, and to shame the boys — now men — that were involved in this hideous, heart-shattering bet.”

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No Remorse: Rebecca's killer Joshua Davies laughed throughout his murder trial before being found guilty.

After Davies had killed Rebecca, he later proudly taking another of his friends to where her body lay.

According to the other boy initially arrested – the defence blamed him for the murder – Josh had boasted: ‘Do you know how hard it is to break someone’s neck?’ before describing how he’d hit her repeatedly with the rock.

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Crime Scene: Police close to the location where Rebecca's body was found in a wooded area just outside Aberkenfig, Bridgend, south Wales.

Sonia has two other children, Jessica and Jack, and is now fighting for a private prosecution against the two friends who knew of Davies’ intentions yet told no one.

She added: “During the trial, they claimed they thought he was joking about his threat to kill Becca. I consider them guilty of perverting the course of justice at the very least. Meanwhile, we have had to move house for a new start.

“We felt uncomfortable Joshua and his associates knew where we lived. We’ve kept a spare bedroom for Becca’s things: the wardrobes she built, her posters and clothes. I go in there every day to feel closer to her.

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Final Picture: Sonia Oatley and her daughter Rebecca in what is believed to be her last photo.

“And each year, on her birthday in February, we do the same things we would have had she been alive — she liked to go to a restaurant in Cardiff Bay or for walks on the beach. But now there is no laughing, only pain and tears.

“All bereavement is hard – there’s no league table of pain – but losing a daughter in such horrific circumstances makes you feel desolate.

“The only comfort I have is that I believe Becca lives on. Whatever others think of an afterlife, I feel she is with me and I know she is safe in heaven. She will never be forgotten.”

‘Bye Mam, I Love You: A Daughter’s Last Words. A Mother’s Search For Justice. The Shocking True Story Of The Murder Of Rebecca Aylward’ will be published by John Blake on August 7